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   The 'unknown' format is a special JXTA ID format used by the J2SE 
   implementation to manage ids of formats which are not recognized. No ids of 
   format 'unknown' are ever emitted nor can any new ids be created.

   @see <a href="https://jxta-spec.dev.java.net/nonav/JXTAProtocols.html#ids" target="_blank">JXTA Protocols Specification : IDs</a>
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